带有 Grails/Groovy 的 Mockito 中的错误 [英] Bug in Mockito with Grails/Groovy

问题描述

我将 Mockito 1.9 与 Grails 1.3.7 一起使用，但我遇到了一个奇怪的错误.

I am using Mockito 1.9 with Grails 1.3.7 and I have a strange bug.

java 中的以下测试用例有效:

The following test case in java works:

import static org.mockito.Mockito.*;

public class MockitoTests extends TestCase {

    @Test
    public void testSomeVoidMethod(){
        TestClass spy = spy(new TestClass());
        doNothing().when(spy).someVoidMethod();
    }

    public static class TestClass {

        public void someVoidMethod(){
        }
    }
}

这个在 groovy 中的测试不起作用:

This test in groovy does not work:

import static org.mockito.Mockito.*

public class MockitoTests extends TestCase {

    public void testSomeVoidMethod() {
        def testClassMock = spy(new TestClass())
        doNothing().when(testClassMock).someVoidMethod()
    }

}

public class TestClass{

    public void someVoidMethod(){
    }
}

这是错误信息:

only void methods can doNothing()!
Example of correct use of doNothing():
    doNothing().
    doThrow(new RuntimeException())
    .when(mock).someVoidMethod();
Above means:
someVoidMethod() does nothing the 1st time but throws an exception the 2nd time is called
org.mockito.exceptions.base.MockitoException: 
Only void methods can doNothing()!
Example of correct use of doNothing():
    doNothing().
    doThrow(new RuntimeException())
    .when(mock).someVoidMethod();
Above means:
someVoidMethod() does nothing the 1st time but throws an exception the 2nd time is called
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.createPogoSite(CallSiteArray.java:129)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallSite(CallSiteArray.java:146)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:40)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:120)

有没有人发现同样的错误?

Does anymone observed the same error?

推荐答案

问题是 Groovy 在你的方法调用到达 someVoidMethod 之前拦截了它.实际调用的方法是 getMetaClass，它不是 void 方法.

The problem is Groovy is intercepting your method call before it reaches someVoidMethod. The method actually being called is getMetaClass which is not a void method.

您可以通过替换来验证这是否正在发生:

You can verify this is happening by replacing:

doNothing().when(testClassMock).someVoidMethod()

与:

doReturn(testClassMock.getMetaClass()).when(testClassMock).someVoidMethod()

我不确定您是否能够使用股票 Mockito 和 Groovy 解决此问题.

I'm not sure you will be able to get around this issue using stock Mockito and Groovy.

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